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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b64fdd1524cb5312237ceb02c73cadb90a522190f7c552568e984ec8e8c0e32' 
  AND token = 'fx02uRkaVAyRu+ectDKJFsKZteRhb8YN3uTq8t757io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}